Summary: Protobuf will be used as part of Pxl autodoc. This protobuf will act as the holder both of messages from cpp -> GO docstring parser and go to UI  docs renderer

Test Plan: n/a

Reviewers: zasgar, #engineering

Reviewed By: zasgar, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D5962

GitOrigin-RevId: f012db381efcc2c8661af79583e5d4a58c1158de